[PATCH] ubsan: Do not run the testsuite if ubsan does not work at all

[Segher Boessenkool]

I normally build with --disable-libsanitizer, because the sanitizers
testresults are very unreproducable, so just annoying noise.  This however
makes most (all?) ubsan testcases fail, since they want to load a shared
library that does not exist.

This patch disables the ubsan testcases if a trivial program does not
run when compiled with ubsan.

Tested on powerpc64-linux, -m32,-m32/-mpowerpc64,-m64,-m64/-mlra;
5452 failures gone, no other changes.

Okay for mainline?


Segher


2014-12-24  Segher Boessenkool  <seg...@kernel.crashing.org>

gcc/testsuite/
        * lib/ubsan-dg.exp (check_effective_target_fsanitize_undefined):
        Check if testcases run without errors, not just if they compile.

---
 gcc/testsuite/lib/ubsan-dg.exp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/lib/ubsan-dg.exp b/gcc/testsuite/lib/ubsan-dg.exp
index 3bfdcc8..cea3e0e 100644
--- a/gcc/testsuite/lib/ubsan-dg.exp
+++ b/gcc/testsuite/lib/ubsan-dg.exp
@@ -18,7 +18,7 @@
 # code, 0 otherwise.
 
 proc check_effective_target_fsanitize_undefined {} {
-    return [check_no_compiler_messages fsanitize_undefined executable {
+    return [check_runtime fsanitize_undefined {
        int main (void) { return 0; }
     } "-fsanitize=undefined"]
 }
-- 
1.8.1.4